Elm Sawfly

Found in deciduous forests, wooded areas, and parks across North America, particularly near elm and willow trees.

Adults feed on the sap of various deciduous trees (elm, willow, birch) after stripping bark; larvae feed on the foliage of the same trees.

Active during late spring and summer. Unlike bees or wasps, they lack a sting but possess powerful mandibles for stripping bark. They exhibit complete metamorphosis with larvae resembling caterpillars.

Generally harmless to humans as they do not sting, though they can deliver a pinch with their mandibles if handled. They are minor forest pests that can occasionally defoliate trees but rarely cause permanent damage.